Add PHP 5.6 and PHP 7 to test matrix (cherry picked from commit 82d79e4)
Add PHP 5.6 and PHP 7 to test matrix
(cherry picked from commit 82d79e4)

leftees/galleryplus,patman15/galleryplus,patman15/galleryplus,efueger/galleryplus,leftees/galleryplus,leftees/galleryplus,patman15/galleryplus,efueger/galleryplus